diff --git a/bt5/erp5_km/SkinTemplateItem/portal_skins/erp5_km_theme/Base_viewKMFieldLibrary/listbox_thumbnail.xml b/bt5/erp5_km/SkinTemplateItem/portal_skins/erp5_km_theme/Base_viewKMFieldLibrary/listbox_thumbnail.xml
index 5d53076267d13a743ec9b76afd6924878ec1a19c..6dbdbe01dd68687f2ccc5b1193d5ef76c27aeeb7 100644
--- a/bt5/erp5_km/SkinTemplateItem/portal_skins/erp5_km_theme/Base_viewKMFieldLibrary/listbox_thumbnail.xml
+++ b/bt5/erp5_km/SkinTemplateItem/portal_skins/erp5_km_theme/Base_viewKMFieldLibrary/listbox_thumbnail.xml
@@ -11,7 +11,6 @@
             <value>
               <list>
                 <string>default</string>
-                <string>image_format</string>
               </list>
             </value>
         </item>
@@ -67,12 +66,6 @@
                     <key> <string>form_id</string> </key>
                     <value> <string></string> </value>
                 </item>
-                <item>
-                    <key> <string>image_format</string> </key>
-                    <value>
-                      <persistent> <string encoding="base64">AAAAAAAAAAM=</string> </persistent>
-                    </value>
-                </item>
                 <item>
                     <key> <string>target</string> </key>
                     <value> <string></string> </value>
@@ -96,10 +89,6 @@
                     <key> <string>form_id</string> </key>
                     <value> <string>Base_viewFieldLibrary</string> </value>
                 </item>
-                <item>
-                    <key> <string>image_format</string> </key>
-                    <value> <string>png</string> </value>
-                </item>
                 <item>
                     <key> <string>target</string> </key>
                     <value> <string>Click to edit the target</string> </value>
@@ -123,17 +112,4 @@
       </dictionary>
     </pickle>
   </record>
-  <record id="3" aka="AAAAAAAAAAM=">
-    <pickle>
-      <global name="TALESMethod" module="Products.Formulator.TALESField"/>
-    </pickle>
-    <pickle>
-      <dictionary>
-        <item>
-            <key> <string>_text</string> </key>
-            <value> <string>python: here.portal_preferences.getPreference(\'preferred_image_format\', \'png\')</string> </value>
-        </item>
-      </dictionary>
-    </pickle>
-  </record>
 </ZopeData>
diff --git a/bt5/erp5_km/bt/revision b/bt5/erp5_km/bt/revision
index 65c6790520f5c2311a702b5ea5c9d8b430476092..87a471804ff49416cdd336ceed171563fab18a1f 100644
--- a/bt5/erp5_km/bt/revision
+++ b/bt5/erp5_km/bt/revision
@@ -1 +1 @@
-1636
\ No newline at end of file
+1638
\ No newline at end of file